Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N R U N H H 8.1 .0057 44.9 —
AFFECTED Product Versions Fixed nltk <= 3.9.3 – —
TIMELINE Mar 18 Reserved by GitHub_M Mar 20 Published (CNA: GitHub_M) Jul 21 EXPLOIT PUBLISHED — CVE-2026-33236 (nltk). Public exploit reference added.
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the `subdir` and `id` attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal sequences (such as `../`), which can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite. Commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a patches the issue.
| Date | Event | Detail |
|---|---|---|
| March 18, 2026 | Reserved | Reserved by GitHub_M |
| March 20, 2026 | Published | Published (CNA: GitHub_M) |
| July 21, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-33236 (nltk). Public exploit reference added. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| nltk | nltk | — | <= 3.9.3 | — |
Authoritative record: CVE-2026-33236 at cve.org
Vendors: nltk
Weaknesses: CWE-22
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-33236 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.